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首页> 外文期刊>土壤圈（英文版） >Using 137Cs Tracer Technique to Evaluate Erosion and Deposition of Black Soil in Northeast China
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Using 137Cs Tracer Technique to Evaluate Erosion and Deposition of Black Soil in Northeast China

机译：利用137Cs示踪技术评价东北黑土的侵蚀与沉积。

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摘要

Soil and water losses through erosion have been serious in the black soil region of Northeast China. Therefore, a sloping cultivated land in Songnen Plain was selected as a case study to: 1) determine the 137Cs reference inventory in the study area; 2) calculate erosion and deposition rates of black soil on different slope locations; 3) conduct a sensitivity analysis of some model parameters; and 4) compare overall outputs using four different models. Three transects were set in the field with five slope locations for each transect, including summit, shoulder-slope, back-slope, foot-slope, and toe-slope. Field measurements and model simulation were used to estimate a bomb-derived 137Cs reference inventory in the study area.Soil erosion and deposition rates were estimated using four 137Cs models and percentage of 137Cs loss/gain. The 137Cs reference value in the study area was 2 232.8 Bq m-2 with 137Cs showing a clear topographic pattern, decreasing from the summit to shoulder-slope, then increasing again at the foot-slope and reaching a maximum at the toe-slope. Predicted soil redistribution rates for different slope locations varied. Among models, the Yang Model (YANG-M) overestimated erosion loss but underestimated deposition. However, the standard mass balance model (MBM1) gave predictions similar to a mass balance model incorporating soil movement by tillage (MBM2). Sensitivity analysis of the proportion factor γand distribution pattern of 137Cs in the surface layer demonstrated the impact of 137Cs enrichment on calculation of the soil erosion rate. Factors influencing the redistribution of fallout 137Cs in landscape should be fully considered as calculating soil redistribution rate using 137Cs technique.
机译：在中国东北的黑土地区，由于侵蚀造成的水土流失十分严重。因此，选择松嫩平原坡耕地作为案例研究：1）确定研究区的137 Cs参考存量。 2）计算黑土在不同坡度位置的侵蚀和沉积速率; 3）对一些模型参数进行敏感性分析;和4）使用四个不同的模型比较整体输出。在野外设置了三个样带，每个样带有五个坡度位置，包括山顶，肩坡，后坡，脚坡和脚趾坡。通过现场测量和模型模拟来估计研究区域内炸弹衍生的137Cs参考库存。使用四个137Cs模型和137Cs损失/收益百分比估算土壤侵蚀和沉积速率。研究区域中的137Cs参考值为2 232.8 Bq m-2，其中137Cs显示出清晰的地形图，从山顶到肩坡逐渐减小，然后在脚坡再次升高，在脚趾坡达到最大值。不同边坡位置的预测土壤重新分配率各不相同。在模型中，Yang模型（YANG-M）高估了侵蚀损失，但低估了沉积。但是，标准质量平衡模型（MBM1）给出的预测与包含耕作土壤运动的质量平衡模型（MBM2）相似。对表层137Cs的比例因子γ和分布规律的敏感性分析表明，137Cs的富集对土壤侵蚀速率的影响。在使用137Cs技术计算土壤中137Cs重新分布的因素时，应充分考虑其影响。

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  • 来源
    《土壤圈（英文版）》 |2006年第2期|201-209|共9页
  • 作者

  • 作者单位

    Northeast Institute of Geography and Agricultural Ecology, CAS, Changchun 130012 China;

    Graduate School of the Chinese Academy of Sciences, Beijing 100039 China;

    Greenhouse & Processing Crops Research Centre, Agriculture & Agri-Food Canada, Harrow, Ontario, N0R 1G0 Canada;

    Northeast Institute of Geography and Agricultural Ecology, CAS, Changchun 130012 China;

    Northeast Institute of Geography and Agricultural Ecology, CAS, Changchun 130012 China;

  • 收录信息 中国科学引文数据库(CSCD);
  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 农业基础科学;
  • 关键词

    black soil, cesium-137 (137Cs), Northeast China, quantitative models, soil erosion;

    机译：黑土;铯137（137Cs）;中国东北;定量模型;土壤侵蚀;
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